Steakc-boiler



' description of the same, reference being had NELSON JOHNSON, OF

jasraa, NEW YORK.

STEAM-BOILER.

Specification of Letters Patent No. 17,042, dated April 14E, `1857'.

To all 'whom t may concern.'

Be it known that I, NELSON JOHNSON, of Jasper, in the county of Steuben and State of New York, have invented a new and use* ful Improvement in Flue-Boilers for Grenera-ting Steam; and do hereby declare that the following is a full, clear, and exact to the accompanying drawings,forming part of this speciHcation, in which- Figure 1, is a central longitudinal vertical section of a `cylindrical Hue boiler with my improvements, the same being represented in its setting. Fig. 2, is a transverse vertical section of the setting of the boiler taken immediately in rear of the boiler. Fig. 3, is a transverse section of the boiler without the setting. Figli, is a front end view of the boiler without the setting. Fig. 5, is an outside view of the Hue of the boiler. Fig. 6, is a longitudinal section of a boiler somewhat modified in its construction from that shown in Fig. 1.

Similar letters of reference indicate corresponding parts in the several Hgures.

This invention consists in a certain arrangement of dampers employed in combination with proper means of communication from the Hre place to the Hue, and from the same to the bottom of the boiler, for the purpose of taking the products of combustion and heated air from the Hre either through the Hue to the chimney without their passing under the boiler, or under the boiler to the chimney without their passing through the Hue, according to the level of the water in the boiler or as other circumstances may render desirable.

To enable others to make and use my inventin, I will proceed to describe its construction and operation.

A, is the cylindrical shell of the boiler having the front head made in two parts a, and b, as shown in Fig. 4, the lower part b, in which terminates the main Hue B, being set back some distance in order that the front end of the Hue may be open to the Hre place C, and yet the Hre place be kept under the bottom of the boiler.

D, is the smoke chamber at the rear of the boiler and E, is the chimney on t-he top of the said chamber, and always in communication with it. The Hue B, forms a means of direct communication from the Hre place to the smoke chamber D, and the passage F, l

at the back of the Hre place forms a means of direct communication from the Hre place under the bottom of the boiler to the smoke chamber. The Hue B, is Htted with a damper G, at its rear end by which to close it and compel all the products of combustion to pass from the Hre under the boiler and through the chamber D, to the chimney as indicated by black arrows in Fig. 1. Another damper H, is Htted to the back of the passage F, at the eXtreme rear of the boiler, said damper, which is shown open in black out-line and closed in red outline in Figs. 1 and 2, being for the purpose of closing the passage F, and causing all the products of combustion to pass through the Hue B, as indicated by the red arrows in Fig. 1.

As a general rule, I intend always to have the damper H, closed and use the boiler as a Hue boiler, but in case of the water getting low, through accident or any unavoidable cause, I close the damper Gr, and open the damper H, and then the boiler operates as a common cylindrical boiler without any danger of burning the Hue, which then consti-` tutes merely a hot air chamber and cannot be very highly heated.

Instead of constructing the front head of the boiler in two parts a, and one behind the other, and not carrying the Hue to the eXtreme end of the boiler, as shown in Fig. 1, the front head of the boiler may be constructed all in one sheet and the Hue brought to the extreme fro-nt, as shown in Fig. 6, and a number of small upright Hues el, d, may be used to convey the products of combustion from the fire place to the main Hue where the damper G, is closed. Or instead of the Hues el, cl, an elbow pipe may be attached to the front end of the Hue and brought down around the end of the cylinder into the fire place.

o, c, are the stays to the main Hue B, consisting of tubes extending diametrically across the said Hue and communicating at each of their ends with the water space of the boiler. These Hues may be arranged in various ways relatively to each other, but I prefer to arrange them so that their Openings stand in spiral lines described around the Hue, as shown in Fig. 5. That arrangement of the stays provides for the staying of the Hue in all directions and causes the least possible obstruction to the draft.

Having thus fully described my invenpurpose of controlling the direction of the products of combustion and using the boiler 10 as a direct draft cylinder boiler or direct Hue boiler.

NELSON JOHNSON. Witnesses i W. E. CRAIG,

ANDREW B. CRAIG. 

